Electric pad or blanket



July 6,1926. l 1,591,305

N. E. GOODRICH ELECTRIC PAD 0R BLANKE'T iled Jan. 26 I 1925 `/N VENTO/e Norris L'. @00dr/'ich ATTORNEYJ` Patented July e, 192s.,

UNITED STATES PATENT `OFFICE.

NORRIS E. GOODRIH, OF BATTLE CREEK, MICHIGAN, ASSIGNOR T SANITAEIUM AND HOSPITAL EQUIPMENT C0.

OF BATTLE CREEK, MICHIGAN.

ELECTRIC PAD onv BLANKET.

Application filed January This invention relates to improvements in electric pads or blankets.

The main object of Athis invention is to providean im roved electric pad or blanket which is very exible and may be repeatedly fiexed without liability of'injury to the resistance wires embodied in the heating element thereof. v Objects pertaining to details and, economies of my invention will definitely appear from the detailed description to follow.

I accomplish the objects of my invention by the devices and means described in the following specification. The invention is' clearly defined and pointed out in the claims.

A structure illustrating myinvention is clearly illustrated lin the accompanying drawing forming a part of this application, in which: Q Y

Fig', I is a perspective view of a heating pad or blanket embodying the features of my invention. l

I Fi II is a fragmentary view illustrating detai s of the heating element, the same being in section on a line corresponding to line' 2-2 of Fig. I.

Fig. III is av fragmentary plan view with a portion of the casing removed.-

Fig. IV is a 'diagrammat' View of the heating elementaand the connections therefor to the switch. a- 1 .In the drawing the sactional views are taken looking in the direction of the little arrows at the ends of the sectipn .lines and similar numerals of reference indicate similar parts in all of the views.

Referring to the drawing, my improved pad or blanket comprises a casing 1 of textile material in which the heating element designated geneia'rly by the numeral 2 is enclosed. This heating element is in the general form of a-woven fabric consisting of the warp strands 3 of textile material and the continuous woof strand 4 which is interwoven back and forth with the warp strands. y

This Woof strand'comprises'a plurality of fine flexible resistance wires 5 enclosed within a tubular casing 6 of 'insulatingmateriaL These fine resistance wires not only provide a very efficient heating element but one which is very fiexible and capable of being repeatedly exed without liability of breaking the strands of wire. The strands being 26, 1925. Serial `No. 4,940.

venclosed by the relatively thick tubular casing 6 prevents sharp bends or knots in the resistance wires.- The resistance wires or strands are'all connected to the circuit wires as a unit. l

In the structure illustrated the circuit `wires 7 and 8`are connected to the ends of the heating. unit wires-or strands while the circuit wire 9 is connected to a central loop 10 thereof through a resistance coil 11, the

object being to provide means for controllingv the heating of the pad; These circuit wires are controlled by a switch which in the structure illustrated consists ofa ybase member 12 and a top adjustable member 13.

ing of textile materiah a heating element in the form of a woven fabric comprising warp strands of textile material, a. co-ntlnuous woof strandinterwoven with said warp strands' and .comprising a lplurality of fine exibl'e resistance Wires enclosed in a flexible continuous tubular.. casing of,insulating material, and circuit wires operatively connected to said resistance wires.

2. A heating element 'forelectric pads or blankets in the form of a woven fabric comprising warp strands, a continuous woof strand interwoven with said warp lstrands andjcomprising a plurality of line tiexible resistance wires enclosed in a flexible strandlike casing, and circuit wires operatively connected to said resistance wires.

3. A heating element for electric pads or blankets in the form of a woven fabric com-- 

